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Kaplan-Meier Survival Curve
fit.pub <- ...
plot(fit.pub, xlab = "Months", ylab = "Probability of Not Being Published")
fit.posres <- ...
plot(fit.posres, xlab = "Months", ylab = "Probability of Not Being Published", col = 3:4)
legend("topright", c("Negative Result", "Positive Result"), col = 3:4, lty = 1)